Chevrolet 70 1969 Series, Shop Manual

Page: 128 / 913

FRONT SUSPENSION 3B-9
7. Make sure threads on king pin and nut are
clean and dry; then install king pin nut. Tighten nut
to minimum torque specified in "Specifications";
then tighten nut until next slot on nut lines up with
cotter pin hole through king pin. Install new cotter
pin, full size of hole.
8. On F-090, F-110 and F-120 axles (inset,
fig. 3), install new inverted expansion plug in lower
hole. Install plug lock ring, seating ring securely
in groove.
9. On F-150 and F-160 axles, if lower bushing
retaining ring (9) is bent or damaged, replace ring.
10. Install new king pin dust cap gasket (5) at
top; then install dust cap (3). Tighten screws firmly.
11. Connect tie rod and drag link to steering
arms. Install brake mechanism and hubs. Check
front end alignment factors and stop screw setting.
12. Lubricate knuckles as directed in LUBRI­
C A T IO N (SEC. 0).
INSPECTION A N D REPAIR
W ash steering knuckle parts (except Delrin
bushing), in cleaning solution, being sure to remove
all dirt and lubricant. If necessary, soak thrust
bearings in cleaner until all old lubricant is dis­
solved; then slush bearings in cleaning solution
until all grit is removed.
C A U T IO N : Delrin bushings must not be washed
in Keytone or chlorinated solvent.
C A U T IO N : Avoid turning bearings in races
when bearing assemblies are dirty, since small
particles of grit will damage bearings. "Specifica­
tions" at end of this group itemize the various fits
and tolerances which apply to all front axles cover­
ed by this manual. It is recommended that all parts
which do not meet these specifications be replaced.
1. Steering Knuckles. After steering knuckles
have been cleaned thoroughly, examine knuckles
for distortion, damage, cracks, or fractures. If
Magna-Flux inspection equipment is available, use
this method to inspect steering knuckles and king
pins for minute cracks, checks, or fractures which
otherwise would not be visible to the naked eye.
2. Thrust Bearing. Examine thrust bearings
for excessive wear, pitting, or other damage. If
these conditions are evident or if bearing retainers
are bent or damaged, bearings should be replaced.
3. Steering Knuckle Bushings. Replace steer­
ing knuckle bushings if wear is indicated, or if re­
sults given previously under "Front Wheel Cam ber"
in " F R O N T E N D A L I G N M E N T " (SEC. 3A), indicates
replacement is necessary.
a. Bushing Removal. Bushings are split Delrin
floating-type. To remove, slide bushings out of
knuckle bore.
b. Bushing Installation. When installing bush­
ings, remove nicks and burrs from knuckle bushing
bore and polish with medium grit abrasive paper
or cloth. Apply lubricant specified in L U B R IC A ­
T IO N (SEC. 0) of this manual, to all parts and in­
stall the bushings in the knuckle bores.
4. King Pin Inspection. Check diameter of king
pin. Also check for minute cracks or other damage.
If inspection reveals excessive wear, replace king
pin.
5. Axle Center. There are two conditions
which, if either exists, will necessitate replace­
ment of axle center.
a. If king pin holes in axle center ends are
worn to such an extent that a new standard or
oversize king pin fits loosely, axle center must be
replaced.
b. If axle center has been twisted or bent
more than 5 degrees from original shape, the
center should be replaced. When an extreme bent
condition exists, minute invisible fractures may
occur and cause failure under ordinary operating
conditions.
Check axle center for twist with alignment
instruments, or on a bench as illustrated in Front
End Alignment Chart (fig. 1). If equipment is avail­
able, use Magna-Flux method to check axle center
for minute fractures.
Refer to next page for Specifications.
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L